2016-05-27 17:13:24,137 Trac[main] DEBUG: Dispatching <RequestWithSession 
"POST '/admin/ticket/workflowadmin'">
2016-05-27 17:13:24,139 Trac[session] DEBUG: Retrieving session for ID 
u'tiaxxxxxx'
2016-05-27 17:13:24,144 Trac[chrome] DEBUG: Prepare chrome data for request
2016-05-27 17:13:24,152 Trac[main] DEBUG: Negotiated locale: None -> zh_CN
>, referrer 'http://xxxx.com/trac/admin/ticket/workflowadmin'
Traceback (most recent call last):
  File "build/bdist.linux-x86_64/egg/trac/web/main.py", line 562, in 
_dispatch_request
    dispatcher.dispatch(req)
  File "build/bdist.linux-x86_64/egg/trac/web/main.py", line 249, in 
dispatch
    resp = chosen_handler.process_request(req)
  File "build/bdist.linux-x86_64/egg/trac/admin/web_ui.py", line 119, in 
process_request
    path_info)
  File "build/bdist.linux-x86_64/egg/tracworkflowadmin/web_ui.py", line 
137, in render_admin_panel
    self._parse_request(req)
  File "build/bdist.linux-x86_64/egg/tracworkflowadmin/web_ui.py", line 
686, in _parse_request
    params = json.loads(req.args.get('params'))
  File "/usr/lib64/python2.6/json/__init__.py", line 307, in loads
    return _default_decoder.decode(s)
  File "/usr/lib64/python2.6/json/decoder.py", line 319, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
TypeError: expected string or buffer
2016-05-27 17:13:24,364 Trac[web_ui] DEBUG: GridModifyModule: filter_stream 
entered

I emergence of this issue in the use of workflow gui

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